1.Kill,execute,murder all mean to deprive of life. Kill is the general word, with no implication of the manner of killing, the agent or cause, or the nature of what is killed (whether human being, animal, or plant): to kill a person.Execute is used with reference to the putting to death of one in accordance with a legal sentence, no matter what the means are: to execute a criminal.Murder is used of killing a human being unlawfully: He murdered him for his money.

mid-15c., present participle adjective from kill (v.). Meaning "very funny" is from 1844. As a noun, "large profit," 1886, American English slang.

kill

v.

c.1200, "to strike, hit, beat, knock;" c.1300, "to deprive of life," perhaps from an unrecorded variant of Old English cwellan "to kill" (see quell), but the earliest sense suggests otherwise. Sense in to kill time is from 1728. Related: Killed; killing. Kill-devil, colloquial for "rum," especially if new or of bad quality, is from 1630s.

kill

n.2

"stream," 1630s, American English, from Dutch kil, from Middle Dutch kille "riverbed," especially in place names (e.g. Schuylkill). A common Germanic word, the Old Norse form, kill, meant "bay, gulf" and gave its name to Kiel Fjord on the German Baltic coast and thence to Kiel, the port city founded there in 1240.

kill

n.1

early 13c., "a stroke, a blow," from kill (v.). Meaning "act of killing" is from 1814; that of "a killed animal" is from 1878. Lawn tennis serve sense is from 1903. The kill "the knockout" is boxing jargon, 1950.